Detry is going for a PGA Tour card, only reason he'd be here. The KFT Finals is different from the regular Korn Ferry Tour; the standings reset, and only the KFT Top 75 and PGA 126-200 (or equivalent non-members) can play. Detry played well enough in The Open and Scottish Open (both PGA co-sponsored) to get in as a non-member, joining a handful of other international players.
25 cards are up for grabs in the three-tournament series, so one strong weekend (i.e. top 5) would probably be enough to get a card. After Boise, the next two tournaments are in Columbus and Newburgh, IN, so hopefully a return to the midwest helps them both.
Currently Thomas is T14 and Nick is T19 with a few holes left, so they should be in good position for the weekend!